An axial compression CU test has been performed on an undisturbed specimen of 100% saturated organic clay. The data for the test is given in Problem. A lateral extension test is to be performed on an identical specimen at the same consolidation pressure and with the same time of consolidation and time of loading as in the axial compression test.
(a) Plot the total and effective stress paths. Determine the curve of pore pressure versus (1) principal stress difference and (2) axial strain that you would predict theoretically for the lateral extension test.
(b) On thep-q diagram, draw the line corresponding to zero induced pore pressure and the line along which the magnitude of the induced negative pore pressure is equal to the principal stress difference.
(c) What is Af for both the AC and LE test?
(After A. Casagrande and R. C. Hirschfeid.)
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